Daily AI Builder Brief - May 3, 2026

Executive Summary

Claude Code 2.1.126 (May 1) adds claude project purge, gateway-aware /model picker, and broader --dangerously-skip-permissions scope.
Anthropic retired the context-1m-2025-08-07 beta header for Sonnet 4.5 and Sonnet 4 on April 30. Requests over 200k now error.
MCP SDKs cut releases this week: Python and Go on May 1, Ruby on May 2. MCP Inspector also updated May 1.
No new Anthropic news posts in the last 48 hours. Most recent was "Claude for Creative Work" on April 28.
Nothing on the MCP blog since April 8. Spec work is happening in SDKs and Inspector, not posts.
Builder takeaway: if you're on Sonnet 4.5 with long context, migrate to Sonnet 4.6 today.

Claude Code

2.1.126 (May 1, 2026)

claude project purge [path] deletes all transcripts, tasks, file history, and config for a project. Supports --dry-run, -y, -i, --all. Useful for client handoffs and clean re-onboarding.

/model picker now reads from your gateway's /v1/models endpoint when ANTHROPIC_BASE_URL points at an Anthropic-compatible gateway. Multi-tenant gateway users finally get accurate model lists.

--dangerously-skip-permissions now also bypasses prompts for writes to .claude/, .git/, .vscode/, and shell config files. Catastrophic removals still prompt. Audit your auto-mode workflows.

OAuth login accepts pasted codes when the browser callback can't reach localhost. Fixes WSL2, SSH, and container login flows. Telemetry: skill_activated now carries invocation_trigger.

Source

Anthropic

1M Context Beta Retired for Sonnet 4.5 and 4 (April 30, 2026)

The context-1m-2025-08-07 beta header is now a no-op on Sonnet 4.5 and Sonnet 4. Requests over 200k tokens return an error. To keep 1M context, move to Sonnet 4.6 or Opus 4.6, where it's GA at standard pricing with no header. Source

MCP Ecosystem

SDK Releases (May 1-2, 2026)

Python SDK and Go SDK shipped on May 1. Ruby SDK shipped on May 2. MCP Inspector also updated May 1. No accompanying blog post; check repo changelogs for details. Source

Broader AI

Nothing today that meets the bar.

What This Means For Builders

If your agent stack pins context-1m-2025-08-07 against Sonnet 4.5, it broke three days ago. Fix the model ID, drop the header.
Use claude project purge --dry-run before you wipe anything. The new flag handles transcripts, tasks, and config in one shot.
If you run a custom gateway, the new /v1/models integration lets your team see real model availability instead of stale defaults.
MCP SDK churn is steady. If you ship MCP servers, pin SDK versions and bump on a cadence.